M16C/62P Group (M16C/62P, M16C/62PT)
24. Precautions
Rev.2.41
Jan 10, 2006
Page 364 of 390
REJ09B0185-0241
•
Suggestions to reduce power consumption
Ports
The processor retains the state of each I/O port even when it goes to wait mode or to stop mode. A current
flows in active I/O ports. A pass current flows in input ports that high-impedance state. When entering wait
mode or stop mode, set non-used ports to input and stabilize the potential.
A/D converter
When A/D conversion is not performed, set the VCUT bit of ADiCON1 register to “0” (no VREF
connection).
When A/D conversion is performed, start the A/D conversion at least 1
µ
s or longer after setting the VCUT bit
to “1” (VREF connection).
D/A converter
When not performing D/A conversion, set the DAiE bit (i=0, 1) of DACON register to “0” (input inhibited)
and DAi register to “00h”.
Stopping peripheral functions
Use the CM0 register CM02 bit to stop the unnecessary peripheral functions during wait mode.
However, because the peripheral function clock (fC32) generated from the sub-clock does not stop, this
measure is not conducive to reducing the power consumption of the chip. If low speed mode or low power
dissipation mode is to be changed to wait mode, set the CM02 bit to “0” (do not peripheral function clock
stopped when in wait mode), before changing wait mode.
Switching the oscillation-driving capacity
Set the driving capacity to “LOW” when oscillation is stable.
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